A comprehensive ARPES study on the type-II Dirac semimetal candidate Ir1-xPtxTe2

Jiang, Juan; Lee, Sangjae; Fei, Fucong; Song, Fengqi; Vescovo, Elio; Kaznatcheev, Konstantine; Walker, Frederick J.; Ahn, Charles H.

doi:10.1063/5.0011549

Title: A comprehensive ARPES study on the type-II Dirac semimetal candidate Ir_1-xPt_xTe₂

Journal Article · Mon Jun 01 00:00:00 EDT 2020 · APL Materials

DOI:https://doi.org/10.1063/5.0011549· OSTI ID:1638802

^[1]; Lee, Sangjae ^[1]; Fei, Fucong ^[2];

^[2]; Vescovo, Elio ^[3]; Kaznatcheev, Konstantine ^[3]; Walker, Frederick J. ^[1]; Ahn, Charles H. ^[1]

Yale Univ., New Haven, CT (United States)
Nanjing Univ. (China)
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

The transition metal dichalcogenide Ir_1-xPt_xTe₂ displays both superconductivity and a topological band structure. Using angle-resolved photoemission spectroscopy, we obtain a comprehensive understanding of the three-dimensional electronic structure in the normal state of Ir_1-xPt_xTe₂ for doping levels from x = 0.1 to 0.4, which spans the composition range of a superconducting state to a non-superconducting state. Many features of the electronic structure can be attributed to strong Te–Te interactions between the layers of the layered crystal structure and can be resolved by photon energy dependent measurements. We demonstrate that the type-II Dirac fermions can be successfully tuned via Pt doping, where the Dirac point lies close to the Fermi level for x = 0.1. The band evolution vs doping provides a clearer understanding of the relationship between the superconductivity and electronic structure. In addition, the β band in the superconducting samples locates the system close to a type-II van Hove singularity, where spin triplet paring symmetry has been predicted. Our results provide a comprehensive understanding of the band structure of Ir_1-xPt_xTe₂, and we discuss the possibilities of the existence of topological superconductivity in this system.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; SC0019211

OSTI ID:: 1638802

Alternate ID(s):: OSTI ID: 1632232

Report Number(s):: BNL-216129-2020-JAAM; TRN: US2202026

Journal Information:: APL Materials, Vol. 8, Issue 6; ISSN 2166-532X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Title: A comprehensive ARPES study on the type-II Dirac semimetal candidate Ir_1-xPt_xTe₂